-- @testpoint: opengauss关键字constraints(非保留)，作为函数名，部分测试点合理报错

--关键字不带引号-成功
drop function if exists constraints;
create function constraints(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带双引号-成功
drop function if exists "constraints";
create function "constraints"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带单引号-合理报错
drop function if exists 'constraints';
create function 'constraints'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `constraints`;
create function `constraints`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function if exists constraints;
drop function if exists "constraints";